Fluid on-off control structure

Abstract

The utility model discloses a fluid on-off control structure, which relates to the technical field of dental cleaning equipment and comprises a first element, a second element and a driving component. The first element is provided with a first conduction part and a second conduction part; a third conduction part is arranged on the second element, and the second element and the first element are in surface contact sealing; and the driving assembly is used for driving the second element, so that the third conduction part is connected or staggered between the first conduction part and the second conduction part. The fluid on-off control structure disclosed by the utility model is applied to the dental sand powder gun, can quickly respond and control the on-off of the fluid, and is more durable in structure, good in air tightness and long in service life.

Description

Technical Field

[0001] The utility model relates to the technical field of dental cleaning equipment, in particular to a fluid on-off control structure applied to a dental cleaning sandblasting gun. Background Art

[0002] Sandblasting is a method of cleaning the teeth by using compressed air to drive sandblasting powder (usually sodium bicarbonate, glycine or erythritol) to spray onto the tooth surface, and then merge with the liquid medium (usually water) sprayed out together, and use a certain kinetic energy to impact the dental plaque and calculus on the tooth surface to achieve the effect of cleaning the tooth surface. It can effectively prevent periodontal disease and maintain dental health.

[0003] The sandblasting and tooth cleaning equipment has a sandblasting main unit and a sand powder gun, which are connected by a pipeline. After the dental sandblasting main unit stops, the sandblasting will continue because there is still a certain air pressure inside the sand powder gun, which is not conducive to rapid response control. Therefore, it is necessary to arrange an on-off control structure between the sand powder chamber (compressed air and sand powder mixing chamber) and the nozzle (fluid ejection component) to facilitate the rapid cutting off of the sand powder ejection.

[0004] The existing technology is to set a pinch valve between the sand powder chamber and the nozzle. Its working principle is that the driving mechanism pushes the pressure rod onto the hose through thrust, so that the hose is compressed and deformed, thereby cutting off the fluid inside the hose. However, since the pinch valve is controlled by extrusion force, and the internal fluid contains sand particles that will rub and cut the hose, the hose is easily worn and leaked, the air tightness becomes poor, and the maintenance cost is increased. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a fluid on-off control structure, which is suitable for a sand powder gun used for sandblasting and cleaning teeth, can respond to control quickly, has good air tightness, is more durable and has a long service life.

[0006] In order to solve the above problems, the utility model adopts the following technical solutions:

[0007] A fluid on-off control structure is applied to dental equipment, comprising a first element, a second element and a drive assembly; the first element is provided with a first conductive part and a second conductive part; the second element is provided with a third conductive part, and there is at least one surface contact seal between the second element and the first element; the drive assembly is used to drive the first element and / or the second element so that the third conductive part is connected or staggered between the first conductive part and the second conductive part.

[0008] Furthermore, the surface roughness of the first element and the second element is less than Ra0.8 μm, the material hardness is greater than 180 HV, and the flatness of the contact surface of the first element and the second element is less than 0.01 mm.

[0009] Furthermore, the surface roughness of the first element and the second element is less than Ra0.2 μm, the material hardness is greater than 500 HV, and the flatness of the contact surface of the first element and the second element is less than 0.005 mm.

[0010] Furthermore, the first element and the second element are made of ceramic material or stainless steel material, which is hard, smooth, corrosion-resistant, and not easy to wear, which is conducive to extending the service life.

[0011] Furthermore, the first element includes an upper plate and a lower plate, the first conductive portion is arranged on the upper plate, the second conductive portion is arranged on the lower plate, and the second element is an intermediate plate located between the upper plate and the lower plate.

[0012] Furthermore, the first element is a single plate, the first conductive part and the second conductive part are both arranged on the plate, the second element is closely arranged at the lower end of the first element, and the third conductive part is a groove opened downward from the upper end surface of the second element.

[0013] Furthermore, an outer shell is disposed outside the first element and the second element, and an elastic element is disposed between the outer shell and the first element so that the first element is close to the second element.

[0014] Furthermore, a first interface for introducing fluid and a second interface for discharging fluid are provided on the outer shell, the first interface is communicated with the first conducting part, and the second interface is communicated with the second conducting part.

[0015] Furthermore, a first sealing ring is provided between the side surface of the first element and the outer shell.

[0016] Furthermore, a second sealing ring for sealing is provided between the first element and the second element.

[0017] Furthermore, the driving assembly includes a cylinder body, a first spring and a piston, the second element is fixed to the piston, the cylinder body gas can act on one end of the piston, and the first spring is arranged at the other end of the piston for resetting the piston.

[0018] Furthermore, the driving assembly includes a piston, a second spring and an electromagnet. The piston is made of ferromagnetic material, and the second spring is arranged between the piston and the electromagnet.

[0019] A fluid on-off control structure comprises a first element, a second element and a drive assembly; the first element is provided with a first conducting portion; the second element is provided with a third conducting portion, and a surface contact seal is formed between the second element and the first element; the drive assembly is used to drive the first element and / or the second element to connect or stagger the third conducting portion with the first conducting portion.

[0020] A fluid on-off control structure comprises a first element, a second element and a driving assembly; the first element is provided with a first conducting portion and a second conducting portion; the second element is provided with a third conducting portion, and a surface contact seal is formed between the second element and the first element; the driving assembly is used to drive the first element and / or the second element so that the third conducting portion is connected or staggered between the first conducting portion and the second conducting portion.

[0021] The first element is a cylinder, the first conductive part and the second conductive part are arranged on the side of the first element, the second element is a core rod arranged inside the first element, and the third conductive part is a through hole radially penetrating the second element.

[0022] Furthermore, the driving component adopts one of a motor, an electromagnet, and a cylinder to control the rotation or movement of the second element.

[0023] Furthermore, the first element also serves as an outer shell, and pipe joints are respectively provided on the first conducting portion and the second conducting portion.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. The movement of the first element and / or the second element is controlled by the driving component, so that the first conductive part and the second conductive part on the first element are turned on or off. When it is applied to a dental sand powder gun, the sandblasting control can get a quick response, which is conducive to controlling the quick start and stop of the sandblasting.

[0026] 2. The movement of the first element and / or the second element is controlled by the driving assembly to cut off the first conductive part and the second conductive part. Compared with the prior art that uses external force to squeeze the hose to deform, the first element and the second element are not easily worn, thereby extending the service life and reducing repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of Example 1 of the utility model.

[0028] Figure 2 It is an exploded view of embodiment 1 of the utility model.

[0029] Figure 3 It is a cross-sectional view of Example 1 of the present utility model.

[0030] Figure 4 It is a cross-sectional view of Example 2 of the present utility model.

[0031] Figure 5 It is a cross-sectional view of Example 3 of the present utility model.

[0032] Figure 6 It is a schematic diagram of the structure of the first element and the second element of Example 4 of the utility model.

[0033] Figure 7 It is a schematic structural diagram of the first element and the second element in Embodiment 5 of the present utility model.

[0034] Figure 8 It is a schematic structural diagram of the first element and the second element in Embodiment 6 of the present utility model.

[0035] Reference numerals in the figure: 1, outer housing; 2, drive assembly; 21, cylinder block; 22, piston; 23, first spring; 24, second spring; 25, electromagnet; 3, first interface; 4, second interface; 5, first element; 6, first conduction part; 7, second element; 8, third conduction part; 9, second conduction part; 10, first sealing ring; 11, pipe joint; 12, elastic element; 13, second sealing ring. Detailed implementation manners

[0036] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0037] Embodiment 1:

[0038] As Figures 1 to 3 shown, this embodiment provides a fluid on-off control structure applied to dental equipment. The structure includes an outer housing 1, a first element 5, a second element 7 and a drive assembly 2. Both the first element 5 and the second element 7 are arranged inside the outer housing 1.

[0039] The outer housing 1 is provided with a first interface 3 for introducing fluid and a second interface 4 for discharging fluid.

[0040] A first sealing ring 10 for sealing is provided between the side surface of the outer housing 1 and the first element 5. The first sealing ring 10 is sleeved on the side surface of the first element 5 to prevent fluid leakage. Among them, the first element 5 includes an upper plate and a lower plate. A first conduction part 6 is opened in the middle of the upper plate, and a second conduction part 9 is opened in the middle of the lower plate, such as a through hole with a circular cross-section, and they are coaxially aligned. The first interface 3 is communicated with the first conduction part 6, and the second interface 4 is communicated with the second conduction part 9. In this way, fluid can be introduced into the first conduction part 6 from the first interface 3 and flow to the second interface 4 from the second conduction part 9.

[0041] The second element 7 is an intermediate plate located between the upper plate and the lower plate. The upper surface of the intermediate plate is attached to the lower surface of the upper plate, and the lower surface of the intermediate plate is attached to the upper surface of the lower plate. The intermediate plate is connected between the upper plate and the lower plate in a surface-contact sealing manner. A third conduction part 8 is opened in the middle of the intermediate plate. The third conduction part 8 is a through hole with a circular cross-section, and its diameter is equal to that of the first conduction part 6 and the second conduction part 9.

[0042] Among them, the middle plate can slide relatively between the upper plate and the lower plate, but the middle plate has good sealing performance with the upper plate and the lower plate. For this reason, the surface roughness of the first element 5 and the second element is less than Ra0.8μm, the material hardness is greater than 180HV, and the contact surface flatness of the first element 5 and the second element 7 is less than 0.01mm. If stainless steel is used, preferably, the surface roughness of the first element 5 and the second element 7 is less than Ra0.2μm, the material hardness is greater than 500HV, and the contact surface flatness of the first element 5 and the second element 7 is less than 0.005mm. If a ceramic plate is used, its surface roughness is Ra0.15μm, the material hardness is 600HV, and the contact surface flatness is 0.003mm.

[0043] The driving assembly 2 includes a cylinder body 21, a first spring 23 and a piston 22. The second element 7 is fixed to the piston 22. The gas in the cylinder body 21 can act on one end of the piston 22. The first spring 23 is arranged at the other end of the piston 22 for resetting the piston 22. The piston 22 and the second element 7 are driven to move by the cylinder body 21 by charging and discharging gas, so that the third conducting part 8 is connected or staggered between the first conducting part 6 and the second conducting part 9; in addition, the driving assembly 2 can also drive the first element 5 to move, and drive the first element 5 and the second element 7 to move relative to each other at the same time. Such a driving method can also realize that the third conducting part 8 is connected or staggered between the first conducting part 6 and the second conducting part 9.

[0044] In order to make the structure more compact, the outer shell 1 can be arranged inside the cylinder body 21 , and both sides of the cylinder body 21 are opened to expose the first interface 3 and the second interface 4 .

[0045] In this embodiment, the first element 5 and the second element 7 are both ceramic plates, which have high hardness and are not easy to wear. Compared with the structure of using a push rod to squeeze the hose to cut off the flow in the prior art, it has a longer service life. In addition, the surface roughness between the ceramic plates is low, the fit is high, the air tightness is good, and it is not easy to leak air and powder.

[0046] Embodiment 2:

[0047] like Figure 4As shown, the fluid on-off control structure applied to dental equipment in this embodiment is different from that in embodiment 1 in the structure of the drive assembly 2. In this embodiment, the drive assembly 2 includes a piston 22, a second spring 24 and an electromagnet 25. The piston 22 is made of ferromagnetic material, and the second spring 24 is arranged between the piston 22 and the electromagnet 25. When the electromagnet 25 is energized, the piston 22 is attracted and moves, so that the third conducting part 8 is connected with the first conducting part 6 and the second conducting part 9. When the electromagnet 25 loses power, the third conducting part 8 is staggered with the first conducting part 6 and the second conducting part 9 under the action of the second spring 24. This embodiment uses the electromagnet 25 to control the movement of the piston 22, which has the advantage of fast response speed.

[0048] Embodiment 3:

[0049] like Figure 5 As shown, the fluid on-off control structure applied to dental equipment in this embodiment is different from the above-mentioned embodiment in that an elastic element 12 is provided between the outer shell 1 and the first element 5, so that the first element 5 is close to the second element 7. For example, the elastic element 12 is two springs, which are respectively installed at the upper end of the upper plate and the lower end of the lower plate, and act with the outer shell 1, so that the first element 5 applies a pre-tightening force to the second element 7, thereby improving the airtightness between the first element 5 and the second element 7.

[0050] In addition, in order to improve the sealing performance, a second sealing ring 13 for sealing is provided between the first element 5 and the second element 7. Specifically, an annular sealing groove can be opened on the contact surface of the first element 5 and the second element 7, and the sealing groove surrounds the outer side of the third conductive part 8. The second sealing ring 13 is installed in the sealing groove.

[0051] Embodiment 4:

[0052] like Figure 6 As shown, the difference between this embodiment and the above embodiment lies in the different structures of the first element 5 and the second element 7. In this embodiment, the first element 5 is a ceramic plate with a single-piece surface roughness less than Ra0.8μm, its hardness is greater than 180HV, the contact surface flatness of the first element 5 and the second element 7 is less than 0.01mm, the first conductive portion 6 and the second conductive portion 9 are both arranged on the plate, such as being arranged as two through holes close to each other and axially parallel, the second element 7 is also a ceramic plate with a single-piece surface roughness less than Ra0.8μm, its hardness is greater than 180HV, the contact surface flatness of the first element 5 and the second element 7 is less than 0.01mm, the second element 7 is closely arranged at the lower end of the first element 5, and the third conductive portion 8 is a groove opened downward from the upper end surface of the second element 7. When the lower ends of the first conductive portion 6 and the second conductive portion 9 are both located on the inner side of the third conductive portion 8, they are conductive and the fluid can pass through. When the first conductive portion 6 and / or the second conductive portion 9 are located on the outer side of the third conductive portion 8, they are cut off and the fluid is blocked.

[0053] Since the internal space of a sand powder gun is narrow in practice, the space available for installing the on-off control structure is also very small. Therefore, the first element 5 and the second element 7 both use a single-piece ceramic plate, which is beneficial to reducing the space occupied and the structure is more compact. Therefore, this embodiment is more advantageous in the application of sand powder guns.

[0054] Embodiment 5:

[0055] like Figure 7 As shown, this embodiment provides a fluid on-off control structure, which includes an outer shell 1, a first element 5, a second element 7 and a drive assembly 2, and the first element 5 and the second element 7 are both arranged inside the outer shell 1. Specifically, the first element 5 is a cylinder made of ceramic material, and the second element 7 is a core rod made of ceramic material, which is arranged inside the cylinder in a matching manner, and the surface roughness of their matching surfaces is less than Ra0.8μm, the material hardness is greater than 180HV, and the contact surface flatness of the first element 5 and the second element 7 is less than 0.01mm. The first conductive part 6 and the second conductive part 9 are arranged on the side of the first element 5, such as passing through the cylinder radially, and the two holes on the side wall are the first conductive part 6 and the second conductive part 9 respectively, and the third conductive part 8 is a through hole radially passed through by the second element 7, and the first conductive part 6, the second conductive part 9 and the third conductive part 8 are located at the same height. In order to save materials and space, the first element 5 also serves as the outer shell 1. The first conductive portion 6 and the second conductive portion 9 are respectively provided with pipe joints 11 for connecting pipes for conveying fluid.

[0056] The driving component 2 of this embodiment can adopt a motor. By connecting the second element 7 to the main shaft of the motor, the intermediate transmission element is saved, making the structure more compact, which is convenient for installation inside the sand powder gun. The motor can drive the second element 7 to rotate circumferentially inside the first element 5, so that the third conductive part 8 can be connected or staggered between the first conductive part 6 and the second conductive part 9.

[0057] In addition, the driving component 2 of this embodiment can also adopt the electromagnet or cylinder described in the above embodiments to control the movement of the second element 7.

[0058] Embodiment 6:

[0059] like Figure 8As shown, this embodiment provides a fluid on-off control structure, which includes an outer shell 1, a first element 5, a second element 7 and a drive assembly 2. The first element 5 and the second element 7 are both arranged inside the outer shell 1. The first element 5 is provided with a first conductive portion 6, and the second element 7 is provided with a third conductive portion 8. The first element 5 and the second element 7 are surface-contact sealed. The outer shell 1 is provided with a first interface 3 for introducing fluid and a second interface 4 for exporting fluid. Initially, the first conductive portion 6 is connected to the first interface 3, and the second interface 4 is connected to the third conductive portion 8. Among them, the first element 5 and the second element 7 are both ceramic plates with a single-piece surface roughness less than Ra0.8μm, their hardness is greater than 180HV, and their contact surface flatness is less than 0.01mm. The first element 5 and / or the second element 7 are driven to move by the drive assembly 2, so that the first conductive portion 6 and the third conductive portion 8 are connected or staggered, thereby realizing rapid fluid cutoff or conduction.

[0060] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A fluid on-off control structure, applied to dental equipment, characterized in that: include: A first element, wherein a first conductive portion and a second conductive portion are formed on the first element; a second element, wherein a third conductive portion is disposed on the second element, and at least one surface contact seal is provided between the second element and the first element; A driving component is used to drive the first element and / or the second element so that the third conductive portion is connected or staggered between the first conductive portion and the second conductive portion.

2. The fluid on-off control structure according to claim 1, characterized in that: The surface roughness of the first element and the second element is less than Ra0.8 μm, the material hardness is greater than 180 HV, and the contact surface flatness of the first element and the second element is less than 0.01 mm.

3. The fluid on-off control structure according to claim 2, characterized in that: The surface roughness of the first element and the second element is less than Ra0.2 μm, the material hardness is greater than 500 HV, and the flatness of the contact surface of the first element and the second element is less than 0.005 mm.

4. The fluid on-off control structure according to claim 2, characterized in that: The first element and the second element are made of ceramic material or stainless steel material.

5. The fluid on-off control structure according to claim 1, characterized in that: The first element includes an upper plate and a lower plate, the first conductive portion is arranged on the upper plate, the second conductive portion is arranged on the lower plate, and the second element is an intermediate plate located between the upper plate and the lower plate.

6. The fluid on-off control structure according to claim 1, characterized in that: The first element is a single plate, the first conductive part and the second conductive part are both arranged on the plate, the second element is arranged at the lower end of the first element, and the third conductive part is a groove opened downward from the upper end surface of the second element.

7. The fluid on-off control structure according to claim 5 or 6, characterized in that: An outer shell is arranged outside the first element and the second element, and an elastic element is arranged between the outer shell and the first element so as to make the first element close to the second element.

8. The fluid on-off control structure according to claim 7, characterized in that: The outer shell is provided with a first interface for introducing fluid and a second interface for discharging fluid, the first interface is communicated with the first conducting part, and the second interface is communicated with the second conducting part.

9. The fluid on-off control structure according to claim 8, characterized in that: A first sealing ring is arranged between the side surface of the first element and the outer shell.

10. The fluid on-off control structure according to claim 1, characterized in that: A second sealing ring for sealing is provided between the first element and the second element.

11. The fluid on-off control structure according to claim 1, characterized in that: The driving assembly includes a cylinder body, a first spring and a piston. The second element is fixed to the piston. The gas in the cylinder body can act on one end of the piston. The first spring is arranged at the other end of the piston for resetting the piston.

12. The fluid on-off control structure according to claim 1, characterized in that: The driving assembly comprises a piston, a second spring and an electromagnet. The piston is made of ferromagnetic material, and the second spring is arranged between the piston and the electromagnet.

13. A fluid on-off control structure, characterized in that: include: A first element, wherein a first conductive portion is formed on the first element; a second element, wherein a third conductive portion is disposed on the second element, and at least one surface contact seal is provided between the second element and the first element; A driving component is used to drive the first element and / or the second element to connect or stagger the third conductive portion with the first conductive portion.

14. The fluid on-off control structure according to claim 13, characterized in that: The surface roughness of the first element and the second element is less than Ra0.8 μm, the material hardness is greater than 180 HV, and the contact surface flatness of the first element and the second element is less than 0.01 mm.

15. The fluid on-off control structure according to claim 13, characterized in that: An outer shell is arranged outside the first element and the second element, and an elastic element is arranged between the outer shell and the first element so as to make the first element close to the second element.

16. A fluid on-off control structure, characterized in that: include: A first element, wherein a first conductive portion and a second conductive portion are formed on the first element; A second element, wherein a third conducting portion is disposed on the second element, and a surface contact seal is formed between the second element and the first element; a driving component, the driving component being used to drive the first element and / or the second element so that the third conducting portion is connected to or staggered between the first conducting portion and the second conducting portion; The first element is a cylinder, the first conductive portion and the second conductive portion are arranged on the side of the first element, the second element is a core rod arranged inside the first element, and the third conductive portion is a through hole radially penetrating the second element.

17. The fluid on-off control structure according to claim 16, characterized in that: The surface roughness of the first element and the second element is less than Ra0.8 μm, the material hardness is greater than 180 HV, and the contact surface flatness of the first element and the second element is less than 0.01 mm.

18. The fluid on-off control structure according to claim 16, characterized in that: The driving component adopts one of a motor, an electromagnet and a cylinder to control the rotation or movement of the second element.

19. The fluid on-off control structure according to claim 16, characterized in that: The first element also serves as an outer shell, and the first conducting part and the second conducting part are respectively provided with pipe joints.

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